2B4C image
Deposition Date 2005-09-23
Release Date 2005-11-15
Last Version Date 2024-10-16
Entry Detail
PDB ID:
2B4C
Keywords:
Viral protein/Immune system
Title:
Crystal structure of HIV-1 JR-FL gp120 core protein containing the third variable region (V3) complexed with CD4 and the X5 antibody
Biological Source:
Source Organism:
Human immunodeficiency virus 1 (Taxon ID: 11676)
Homo sapiens (Taxon ID: 9606)
Host Organism:
Drosophila melanogaster
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.30 Å
R-Value Free:
0.34
R-Value Work:
0.31
R-Value Observed:
0.31
Space Group:
P 6 2 2
2B4C validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:T-cell surface glycoprotein CD4
Gene (Uniprot):CD4
Chain IDs:B (auth: C)
Chain Length:181
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P01730 Pfam ID:PF00047, PF05790
Protein Blast
Polymer Type:polypeptide(L)
Molecule:envelope glycoprotein
Mutations:N301Q, T389A
Chain IDs:A (auth: G)
Chain Length:344
Number of Molecules:1
Biological Source:Human immunodeficiency virus 1
UniProt ID:Q75760 Pfam ID:PF00516
Polymer Type:polypeptide(L)
Molecule:anti-HIV-1 gp120 immunoglobulin X5 heavy chain
Chain IDs:D (auth: H)
Chain Length:235
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:anti-HIV-1 gp120 immunoglobulin X5 light chain
Chain IDs:C (auth: L)
Chain Length:215
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Ligand Molecules
NAG
SO4
XYL
Primary Citation
Structure of a V3-containing HIV-1 gp120 core.
Science 310 1025 1028 (2005)
PMID: 16284180 DOI: 10.1126/science.1118398

Abstact

The third variable region (V3) of the HIV-1 gp120 envelope glycoprotein is immunodominant and contains features essential for coreceptor binding. We determined the structure of V3 in the context of an HIV-1 gp120 core complexed to the CD4 receptor and to the X5 antibody at 3.5 angstrom resolution. Binding of gp120 to cell-surface CD4 would position V3 so that its coreceptor-binding tip protrudes 30 angstroms from the core toward the target cell membrane. The extended nature and antibody accessibility of V3 explain its immunodominance. Together, the results provide a structural rationale for the role of V3 in HIV entry and neutralization.

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Primary Citation of related structures
2B4C